generic@generic-computer:/media/generic/959F-4E27$ apt-offline get upgrade.sig --bundle upgrade.zip

Fetching APT Data

Downloading 1
Exception in thread Thread-1:
Traceback (most recent call last):
  File "/usr/lib/python3.8/threading.py", line 932, in _bootstrap_inner
    self.run()
  File "/usr/lib/python3.8/threading.py", line 870, in run
    self._target(*self._args, **self._kwargs)
  File "/usr/lib/python3/dist-packages/apt_offline_core/AptOfflineLib.py", line 696, in run
    self.responseQueue.put( self.WorkerFunction( item, thread_name ) )
  File "/usr/lib/python3/dist-packages/apt_offline_core/AptOfflineCoreLib.py", line 1335, in DataFetcher
    if DownloadPackages(PackageName, pkgFileWithType) is False and guiTerminateSignal is False:
  File "/usr/lib/python3/dist-packages/apt_offline_core/AptOfflineCoreLib.py", line 1304, in DownloadPackages
    if FetcherInstance.download_from_web(PackageName, PackageFile, Str_DownloadDir):
  File "/usr/lib/python3/dist-packages/apt_offline_core/AptOfflineCoreLib.py", line 709, in download_from_web
    temp = urllib.request.urlopen(url)
  File "/usr/lib/python3.8/urllib/request.py", line 222, in urlopen
    return opener.open(url, data, timeout)
  File "/usr/lib/python3.8/urllib/request.py", line 509, in open
    req = Request(fullurl, data)
  File "/usr/lib/python3.8/urllib/request.py", line 328, in __init__
    self.full_url = url
  File "/usr/lib/python3.8/urllib/request.py", line 354, in full_url
    self._parse()
  File "/usr/lib/python3.8/urllib/request.py", line 383, in _parse
    raise ValueError("unknown url type: %r" % self.full_url)
ValueError: unknown url type: '1'

Downloaded data to /media/generic/959F-4E27/upgrade.zip
generic@generic-computer:/media/generic/959F-4E27$